P3
6362677 Change parallel GC collector default number of parallel GC threads.
considered Niagra platform but seems to not consider
other Sparc servers with large # of Cpu's , such as the M9000
which can have 64 or more cpus. There may be others.
In this particular case, the customer had an M9000 w/64 cpu's
JDK 6.0_19
It used the
8 + (n - 8) * 5/8
where n is the number of hardware threads. The
exception is for Niagara2 and later CMT machines
where it is
8 + (n - 8) * 5/16
If it was a Niagra the 5/16 rule would have been used
rather than 5/8 rule.
considered Niagra platform but seems to not consider
other Sparc servers with large # of Cpu's , such as the M9000
which can have 64 or more cpus. There may be others.
In this particular case, the customer had an M9000 w/64 cpu's
JDK 6.0_19
It used the
8 + (n - 8) * 5/8
where n is the number of hardware threads. The
exception is for Niagara2 and later CMT machines
where it is
8 + (n - 8) * 5/16
If it was a Niagra the 5/16 rule would have been used
rather than 5/8 rule.
- relates to
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JDK-6362677 Change parallel GC collector default number of parallel GC threads.
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- Closed
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- Closed
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JDK-8078703 Ensure that GC's use of processor count is correct
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- Open
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